Question: Q34 Suppose f(x, y) is a differentiable function and Vf(a, b) is not the zero vector. How many unit vectors if exist such that Daf(a,

Q34 Suppose f(x, y) is a differentiable function and Vf(a, b)

Q34 Suppose f(x, y) is a differentiable function and Vf(a, b) is not the zero vector. How many unit vectors if exist such that Daf(a, b) =0. How are they related geometrically

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